NEW YORK—Today, Tuesday, Jan. 15, Brookfield Office Properties will begin construction of Manhattan West, a $4.5 billion, 5 million-sq.-ft. development located at Ninth Avenue and 33rd Street.

The first phase of the development commenced with the installation of a 120,000-sq.-ft. platform over the railroad tracks that lead to Pennsylvania Station.

Upon completion, Manhattan West will include two, 2 million-sq.-ft., class A office towers, a residential building, retail space and a 1.5-acre public space.

Manhattan West is being developed as a LEED Gold property.